Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Taxes on Income - Summary of Reconciliation of Effective Income Tax Rate (Detail)

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Taxes on Income - Summary of Reconciliation of Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
Israel tax provision at statutory rate 23.00% 23.00% 23.00% 21.00%
Non-deductible share-based compensation (0.61%) (0.63%) (0.60%)  
Effect of other permanent differences (3.92%) (0.06%) (0.08%)  
Change in valuation allowance (18.95%) (22.32%) (21.94%)  
Other adjustments 0.25% 8212.00% 0.44%  
Effective tax rate (0.23%) (0.01%) (0.06%)